I love these inks and use them in my work all the time. They are very unique in that they are enamel based so when you apply them, they sit on top of the paper. You can use them with a nib pen, or brush. If you use more water with them they will also get a transparent and washy look, while keeping rich color saturation. I also love the range of colors that include both elegant earth tones and rich vibrant colors. You can mix colors together to create ones not available out of the jar and can do so with the convenient eye dropper. Please don't stop making them Sennelier!